Webster's English Dictionary

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cruise

1. cruise \'kru:z\ vb [D kruisen to make a cross, cruise, fr. MD crucen, 
   fr. cru-ce] cross, fr. L cruc-, crux - more at RIDGE 1: to sail about 
   touching at a series of ports  2: to travel for the sake of traveling  3: 
   to go about the streets at random  4: to travel at the most efficient 
   operating speed  1: to cruise over or about  2: to inspect (as land) with 
   reference to possible lumber yield 
2. cruise n : an act or an instance of cruising